State health officials say about 95 percent of Louisiana's drinking water systems have the raised at the standards disinfectant levels ordered statewide after a killer amoeba was found in two systems.

The Department of Health and Hospitals ordered the high levels after the Naegleria fowleri amoeba was found in St. Bernard and DeSoto parish drinking water last year. The Naegleria fowleri amoeba had killed two people in St. Bernard Parish and one in DeSoto Parish since 2011.